f 



MR. J. C. GALTON ON DASVPUS SEXCINCTUS. 55" 



The same anatomist figures, in his plates illustrating the myology of the Otter 1 , as 

 arising from behind the gluteus meclius, and covered by the G. maximus, a very thin 

 accessory slip of the biceps fern oris, which, " au lieu de s'epanouir sur l'aponevrose jam- 

 mere, comme le biceps, se reunit au uastrocneniirn externe, et contribue h former le 

 tendon d'Achille." This seems to answer very fairly to the last factor of the biceps, 

 which I have described. 



A similar accessory factor of the above muscle is figured by the same author in his 

 plates of the anatomy of the Hyaena, and is described as a "niinee et long ruban mus- 

 culaire qui descend tout le long de la cuisse et va se fix<T vers le milieu de la janibe 

 sur le flechisseur du pouce." 



2 



Gastrocnemius. — This muscle arises by two distinct heads from tubercles situated 

 posterior to the inner and outer condyles of the femur respectively, the outermost head 

 having the widest extent of origin. 



This latter takes origin from the ridge at which the strong ligament terminates, which 

 is attached above to the third trochanter of the lemur, and overlaps, moreover, the origin 



of the plantar is. 



It becomes fused with its fellow at about the lower third of t he calf, and is inserted 

 [ into the calcaneum on either side, by a broad aponeurotic tendon, which crosses over the 



slender tendon of the plantar is as it passes into the sole. 



Soleus. — This muscle, which appears to have no tibial origin, arises from a small 

 cavity underneath an overhanging tubercle upon the posterior part of the head of the 

 fibula. Prom this origin it passes straight down, gradually and slightly broadening, to 

 its insertion at the calcaneum, in advance of that of the gastrocnemii. Besides its own 

 proper insertion, some of its fibres blend on either side with the broad tendon of insertion 

 of the above-mentioned muscle, but have in their midst a kind of foramen for the passage 

 of the tendon of the plantaris into the sole of the foot. 



Cuvier, in his ' Lecons' 3 , describes this muscle as of less considerable size in mammals 

 than in man. According to him, it ordinarily attaches itself to the external face of the 

 upper head of the fibula — but sometimes, however, descends to the middle part, as in the 



Ai and the Elephant. 



Popliteus. — This is a muscle of considerable size, triangular or fan-like in shape. It 

 arises, by two short heads, from the external condyle of the femur, immediately behind 

 the posterior head of origin of the hindmost of the peronei muscles. 



The lower of the two heads of origin of this muscle arises from a small depression in 

 the external face of the articular portion of the condyle by a strong roundish tendon, 

 which is, moreover, connected with the external semilunar cartilage. The upper and 

 slighter of the two heads arises fleshy from a smooth facet on the condyle, situated 

 immediately above the pit which affords origin to the first -described factor of the muscle, 

 and is, moreover, in intimate relation with the capsular ligament of the joint. The 

 body of the muscle spreads out, becoming flatter and thinner, to be inserted along nearly 



• Op. cit. pi. 110. fig. 1. * Op- dt. pi. 131. » 2nd ed. vol. i. p. 538 



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